As per census 2011, 97 families residing in the village with the total population of Mandarmani was about 507 out of which 249 are females, and 250 are males. About 16.37% are children from the age group of 0-6. The literacy rate of males and females is about 87.32% and 76.3%, respectively. People mainly speak Bengali and English in Mandarmani.
There are mainly two festivals celebrated here, the first is Sand Fest and the second is Surf fest. In both of these fests, people are filled with excitement, and as the name suggests, there are all set of things to enjoy, from fun games to music to dance on to delicious seafood items to one’s delight. Seafood in Mandarmani is mouthwatering as they serve the best quality of seafood. Fish items are common and are served with different tastes. One can find a variety to choose from. Having a plate of a dish is like seeing a piece of art there.